<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Encrypt.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';

/**
 * @see Zend_Loader
 */
require_once 'Zend/Loader.php';

/**
 * Encrypts a given string
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_Encrypt implements Zend_Filter_Interface {
	/**
	 * Encryption adapter
	 */
	protected $_adapter;
	
	/**
	 * Class constructor
	 *
	 * @param string|array $options (Optional) Options to set, if null mcrypt is used
	 */
	public function __construct($options = null) {
		if ($options instanceof Zend_Config) {
			$options = $options->toArray ();
		}
		
		$this->setAdapter ( $options );
	}
	
	/**
	 * Returns the name of the set adapter
	 *
	 * @return string
	 */
	public function getAdapter() {
		return $this->_adapter->toString ();
	}
	
	/**
	 * Sets new encryption options
	 *
	 * @param  string|array $options (Optional) Encryption options
	 * @return Zend_Filter_Encrypt
	 */
	public function setAdapter($options = null) {
		if (is_string ( $options )) {
			$adapter = $options;
		} else if (isset ( $options ['adapter'] )) {
			$adapter = $options ['adapter'];
			unset ( $options ['adapter'] );
		} else {
			$adapter = 'Mcrypt';
		}
		
		if (! is_array ( $options )) {
			$options = array ();
		}
		
		if (Zend_Loader::isReadable ( 'Zend/Filter/Encrypt/' . ucfirst ( $adapter ) . '.php' )) {
			$adapter = 'Zend_Filter_Encrypt_' . ucfirst ( $adapter );
		}
		
		if (! class_exists ( $adapter )) {
			Zend_Loader::loadClass ( $adapter );
		}
		
		$this->_adapter = new $adapter ( $options );
		if (! $this->_adapter instanceof Zend_Filter_Encrypt_Interface) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Encoding adapter '" . $adapter . "' does not implement Zend_Filter_Encrypt_Interface" );
		}
		
		return $this;
	}
	
	/**
	 * Calls adapter methods
	 *
	 * @param string       $method  Method to call
	 * @param string|array $options Options for this method
	 */
	public function __call($method, $options) {
		$part = substr ( $method, 0, 3 );
		if ((($part != 'get') and ($part != 'set')) or ! method_exists ( $this->_adapter, $method )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Unknown method '{$method}'" );
		}
		
		return call_user_func_array ( array ($this->_adapter, $method ), $options );
	}
	
	/**
	 * Defined by Zend_Filter_Interface
	 *
	 * Encrypts the content $value with the defined settings
	 *
	 * @param  string $value Content to encrypt
	 * @return string The encrypted content
	 */
	public function filter($value) {
		return $this->_adapter->encrypt ( $value );
	}
}
